To build a poultry house, determine its size based on the number and type of poultry to be housed, cut 4-by-4s and 2-by-4s to the required size, and join the pieces appropriately. Use wire mesh for the chicken run.
To build a poultry house for 12 chickens, level and fill the site with 6-inch high stone or sand.
Cut a 4-by-4 and 2-by-4 into two 8-foot pieces for the front and rear bottom and top plates, respectively. Cut the 4-by-4 into two 3-foot-5-inch pieces for the side bottom plates, and the 2-by-4 into two 3-foot-4-inch pieces for the side top plates.
Cut the 2-by-4 to the following measurements: thirteen 4-foot pieces for the sidewalls, cross beams and enclosed floor, four 7-foot-5-inch pieces for the front and rear walls and 2 7-foot-4-inch pieces.
Screw the front and rear walls and two sidewalls using two 7-foot-4-inch long pieces. Attach the front and rear bottom plates to the front wall's bottom edge, the side base plate to the sidewalls and an enclosed floor piece at a height of 2 feet across the right sidewall. Square the walls at each corner. Attach the front, back and side top plates, and affix roof trusses.
Install plywood over the roof, and from the cross beams till the front and rear top plates. Finish using a metal roofing material and siding. Affix six 4-foot long 2-by-4s for the enclosed floor across the cross beams, leaving a 1/2-inch gap between the boards. Finally, build the chicken run.